I was just looking through the discovery panel for new people to follow, but found one piece of information lacking. It would be useful to know how active (e.g. how often they post) a user is when deciding who to follow. Since the submissions aren't dated, looking through people's profiles gave me no information on how often that person posts, which isn't a necessary criteria, but would be nice to know, especially since some users stop activity all together and so following them would be pointless. When hubski becomes more active balancing activity levels between hubs I follow might become more important, since I wouldn't want to see my feed dominated by one extremely active user drowning out the others. Putting dates on hub posts seems like the easiest way to address this, but adding some kind of activity level metric to a users summary might also help.
mk: Funny you should mention that. I am working on an update atm, and one thing that I added to it today was 'user stats' such as average posts per day. It might also be useful to add the date of their last post.The update will roll out in the next few days.
There are quite a few things in the pipeline, actually, including polls and a more useful/interesting saving mechanism. It looks like I am also going to be getting a basic API together.